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液氮有毒吗
更新时间： 2019-05-30 00:00:00  

无毒。液氮：液态的氮气。是惰性的，无色、无臭、无腐蚀性、不可燃、温度极低。氮构成了大气的大部分（体积比78.03%，重量比75.5%）。氮是不活泼的，不支持燃烧，自然不会有毒。汽化时大量吸热接触会造成冻伤。

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